CN221172499U - Fresh air device - Google Patents

Abstract

The utility model provides a fresh air device. This new trend device includes: a housing provided with an opening; the foldable elastic filter element is detachably arranged in the shell through the opening, and one side of the foldable elastic filter element, which is close to the opening, is fixed on the shell; the fixing plate is arranged on one side of the foldable elastic filter element far away from the opening; at least one screw rod is arranged along the direction of the opening, the first end of each screw rod is connected with the fixing plate, the second end of each screw rod penetrates through the shell and is configured to drive the fixing plate to move towards the opening direction, so that the foldable elastic filter element is compressed in the opening direction, and the size of the foldable elastic filter element when being taken out is reduced. According to the scheme of the utility model, the foldable elastic filter element can be folded and compressed, so that the size of the filter element when the filter element is taken out is reduced, and the filter element can be taken out easily under the condition that the size of an external space is limited.

Description

Fresh air device

Technical Field

The utility model relates to a fresh air filtering technology, in particular to a fresh air device.

Background

Fresh air conditioning is becoming one of the indispensable household appliances, but with the increasing severity of the atmospheric environment, fresh air conditioning is becoming particularly important for filtering air. After a period of use, the fresh air conditioner can involve replacing the air filter element, but for some fresh air conditioners placed at corners or with narrow surrounding spaces, the air filter element is limited by the external space and cannot be easily taken out.

Disclosure of utility model

The utility model aims to provide a fresh air device which is not limited by a narrow space and is convenient to take out a filter element.

A further object of the present utility model is to provide a fresh air device with an easily removable filter element.

In particular, the utility model provides a fresh air device. This new trend device includes:

a housing provided with an opening;

The foldable elastic filter element is detachably arranged in the shell through the opening, and one side of the foldable elastic filter element, which is close to the opening, is fixed on the shell;

the fixing plate is arranged on one side of the foldable elastic filter element away from the opening;

At least one screw rod is arranged along the direction of the opening, the first end of each screw rod is connected with the fixing plate, the second end of each screw rod penetrates through the shell and is configured to drive the fixing plate to move towards the opening direction, so that the foldable elastic filter element is compressed in the opening direction, and the size of the foldable elastic filter element when taken out is reduced.

Further, the collapsible resilient filter element further comprises:

The first connecting device is arranged on one side of the foldable elastic filter element away from the opening and is used for connecting the foldable elastic filter element and the fixing plate;

The second connecting device is arranged on one side of the foldable elastic filter element, which is close to the opening, and is used for connecting the foldable elastic filter element and the shell.

Further, the first connecting device comprises at least one first hook, one end of the first hook is connected with the foldable elastic filter element, and the first hook is configured to pull the foldable elastic filter element and hook on the fixed plate;

The second connecting device comprises at least one second hook, one end of the second hook is connected with the foldable elastic filter element and is configured to pull the foldable elastic filter element and hook the foldable elastic filter element on the shell.

Further, the fixing plate comprises at least one threaded hole, the threaded holes are arranged in one-to-one correspondence with the screw rods, and the first ends of the screw rods are configured to rotate in the threaded holes, so that the fixing plate moves in the opening direction along with the rotation of the screw rods.

Further, the number of the screw rods is a plurality, and the screw rods are arranged at intervals along the direction perpendicular to the opening direction.

Further, the fresh air device also comprises a linkage device which is respectively connected with the plurality of screw rods and is configured to drive the plurality of screw rods to synchronously rotate.

Further, the number of the screw rods is one, and the first ends of the screw rods are arranged at the middle positions of the fixing plates.

Further, a sliding groove is provided in the housing along the opening direction, and the sliding groove is provided along the opening direction, so that the fixing plate moves on the sliding groove.

Further, a crank is arranged at the second end of the screw rod so that an operator can operate the screw rod to rotate.

Further, a cover plate is arranged on the outer side of the opening of the shell and is configured to seal the opening, and air flow is prevented from overflowing when the fresh air device works.

According to the fresh air device, the opening is formed in the shell, and the foldable elastic filter element is detachably arranged in the shell through the opening and is fixed on the shell at one side close to the opening. The fixed plate is arranged on one side of the foldable elastic filter element away from the opening. At least one lead screw is arranged along the direction of the opening, the first end of each lead screw is connected with the fixing plate, the second end of each lead screw penetrates through the shell and is configured to drive the fixing plate to move towards the opening direction, so that the foldable elastic filter element is compressed in the opening direction, the size of the foldable elastic filter element when being taken out is reduced, and the filter element can be taken out easily under the condition of being limited by the size of an external space.

Further, the foldable elastic filter element in the fresh air device is further provided with the first connecting device and the second connecting device which are respectively arranged on one side of the foldable elastic filter element far away from the opening and one side of the foldable elastic filter element close to the opening, and the foldable elastic filter element is respectively connected with the fixing plate and the shell, so that the foldable elastic filter element is detachably arranged in the fresh air device.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic view of a fresh air device according to one embodiment of the utility model;

FIG. 2 is a schematic cross-sectional view along section line A-A in FIG. 1;

FIG. 3 is a schematic view of a cartridge in an expanded state in a fresh air device according to one embodiment of the utility model;

FIG. 4 is a schematic view of a filter cartridge in a fresh air device according to one embodiment of the utility model in a compressed state;

FIG. 5 is a schematic view of a mounting plate in a fresh air device according to one embodiment of the utility model;

FIG. 6 is a schematic view of a filter cartridge in a fresh air device according to another embodiment of the utility model; and

FIG. 7 is a schematic view of a fixing plate in a fresh air device according to another embodiment of the present utility model.

Detailed Description

In the description of the present embodiment, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "axial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature, i.e. one or more such features. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present invention as the case may be.

Furthermore, in the description of the present embodiments, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature therebetween. That is, in the description of the present embodiment, the first feature being "above", "over" and "upper" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature "under", "beneath", or "under" a second feature may be a first feature directly under or diagonally under the second feature, or simply indicate that the first feature is less level than the second feature.

Unless otherwise defined, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the description of the present embodiment, a description referring to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

FIG. 1 is a schematic diagram of a fresh air device 100 according to one embodiment of the utility model, the fresh air device 100 generally comprising: a housing 110, a collapsible elastomeric filter cartridge 120, a fixed plate 130, and at least one lead screw 140.

The housing 110 is provided with openings 111, and the positions of the openings 111 are arranged according to the trend of the actual air flow and the arrangement state of the filter element in the housing 110. For example, in the embodiment in which the airflow in the fresh air device 100 is up-and-down, the foldable elastic filter element 120 is horizontally disposed in the housing 110, the opening 111 is provided on the right side wall of the housing 110, and the foldable elastic filter element 120 may be installed into the housing 110 from the opening 111. In other embodiments, the air flow of the fresh air device 100 is back and forth, and the opening 111 should be disposed on the front side or the rear side of the housing 110, respectively. If the air flow of the fresh air device 100 is left and right, the opening 111 should be disposed on the left side or the right side of the casing 110, respectively. The foldable elastic filter element 120 is detachably disposed in the housing 110 through the opening 111, and a side of the foldable elastic filter element 120 adjacent to the opening 111 is fixed to the housing 110.

The foldable elastic filter element 120 is made of double-effect carbon cloth material as core material, and is manufactured into a filter finished product after being folded and the like. The carbon cloth material is characterized in that the carbon layer has a certain thickness, and hot melt adhesive is generally adopted to realize the adhesion between carbon powder and between the carbon powder and non-woven fabrics.

Fig. 2 is a schematic cross-sectional view along section line A-A in fig. 1, with a fixed plate 130 disposed on a side of the collapsible resilient filter element 120 remote from the opening 111. For example, the fixing plate 130 is disposed on the right side of the foldable elastic filter element 120 in this embodiment.

Each screw 140 is disposed along an orientation of the opening 111, a first end of each screw 140 is connected to the fixing plate 130, and a second end of each screw 140 passes through the housing 110. When each screw rod 140 is rotated, each screw rod 140 only rotates, and the fixing plate 130 is driven to move towards the opening 111 along with the rotation of each screw rod 140, so that the foldable elastic filter element 120 is compressed towards the opening 111, and the size of the foldable elastic filter element 120 when taken out is reduced.

In some embodiments, a stop collar 141 may be provided at the end of the first end of each screw 140 to prevent the fixing plate 130 from falling off the first end of the screw 140 due to excessive movement of the fixing plate 130 during movement of the fixing plate 130 as each screw 140 rotates.

The foldable elastic filter element 120 further comprises a first connecting device and a second connecting device, wherein the first connecting device is arranged on one side of the foldable elastic filter element 120 far away from the opening 111 and is connected with the foldable elastic filter element 120 and the fixing plate 130, so that the foldable elastic filter element 120 is detachably and fixedly connected with the fixing plate 130. The second connecting means is disposed on a side of the foldable elastic filter element 120 adjacent to the opening 111 and connects the foldable elastic filter element 120 and the housing 110, thereby detachably and fixedly connecting the foldable elastic filter element 120 to the housing 110. The position on the second connecting means connecting housing 110 is located on the inner wall surface of housing 110 and near the opening 111. When the foldable elastic filter element 120 needs to be detached, a worker can extend his/her hand into the housing 110 from the opening 111, and open the first connecting means and the second connecting means, thereby removing the foldable elastic filter element 120 in a folded and compressed state from the opening 111 and then removing the foldable elastic filter element 120 from the fresh air device 100, so that the foldable elastic filter element 120 can be easily removed even when limited by the size of the external space.

In some embodiments, the first connection device may be a first hook 121, one end of the first hook 121 is connected to the foldable elastic filter element 120, and the first hook 121 may pull the foldable elastic filter element and hook on the fixing plate 130. The second connection means may be a second hook 122, and the second hook 122 may pull the foldable elastic filter element 120 and hook on the housing 110, so that the foldable elastic filter element 120 is fixed inside the housing 110, and when the foldable elastic filter element 120 needs to be unfolded, the fixing plate 130 moves in a direction away from the opening 111, so that the fixing plate 130 is unfolded by pulling the foldable elastic filter element 120 through the first hook 121 and the second hook 122. In addition, at the opening 111 on the fixing plate 130 and inside the case 110, structures (not shown in the drawings) for hooking the first hooks 121 and the second hooks 122 are respectively arranged.

In some embodiments, the number of first hooks 121 and second hooks 122 may be one on each side of the foldable elastic filter element 120 in the direction of the opening 111. When the first hook 121 and the second hook 122 are respectively arranged at two sides, the first hook 121 and the second hook 122 can be arranged at the central position of the foldable elastic filter element 120, and when the fresh air device 100 is in a working state, the foldable elastic filter element 120 can be ensured to be more stable in the shell 110. When the fresh air device 100 works, the foldable elastic filter element 120 is not stable enough when the first hooks 121 and the second hooks 122 are arranged on two sides of the foldable elastic filter element 120, and the foldable elastic filter element 120 may shake continuously inside the casing 110 due to the possibly uneven airflow passing through the foldable elastic filter element 120.

In some embodiments, two first hooks 121 and second hooks 122 may be disposed on both sides of the foldable elastic filter element 120 along the direction of the opening 111, respectively, and may be disposed on four corners of the foldable elastic filter element 120, respectively, so that the foldable elastic filter element 120 may be better opened, and this arrangement method may enable the foldable elastic filter element 120 to continuously maintain a stable state when the fresh air device 100 is operated.

In other embodiments, the number of the first hooks 121 and the second hooks 122 may be three or more on both sides of the foldable elastic filter element 120 in the direction of the opening 111, respectively, and the first hooks 121 and the second hooks 122 may be uniformly spaced on both sides of the foldable elastic filter element 120 in the direction perpendicular to the direction of the opening 111, and the more the number of the first hooks 121 and the second hooks 122, the more stable the state of the foldable elastic filter element 120 inside the case 110 when the fresh air device 100 is operated.

In other embodiments, the first connection device and the second connection device may be a snap connection, which is a relatively economical, efficient, simple and convenient plastic connection manner compared to other connection manners.

In some embodiments, the fixing plate 130 includes at least one screw hole 131, the screw hole 131 being a through hole in the fixing plate 130 in the direction of the opening 111, each screw hole 131 in the fixing plate 130 corresponding to a screw thread in each screw 140, the screw holes 131 being disposed in one-to-one correspondence with the screw 140, the number of screw holes 131 in the fixing plate 130 being the same as the number of screw holes 140 such that a first end of the screw 140 rotates in the screw hole 131, whereby the fixing plate 130 moves in the direction of the opening 111 with the rotation of the screw 140.

Fig. 3 is a schematic view of a filter element in an expanded state in a fresh air device according to an embodiment of the present utility model, and fig. 4 is a schematic view of a filter element in a compressed state in a fresh air device according to an embodiment of the present utility model. When the foldable elastic filter element 120 needs to be replaced, the screw rod 140 is matched with the threaded hole 131 of the fixing plate 130, the screw rod 140 is rotated, the fixing plate 130 moves to the side of the opening 111 along the direction of the opening 111 along with the rotation of the screw rod 140, the relative distance between the fixing plate 130 and the opening 111 is gradually reduced, and accordingly the foldable elastic filter element 120 fixed between the fixing plate 130 and the housing 110 is gradually folded and compressed. After the foldable elastic filter element 120 is compressed to the maximum, the screw 140 is stopped to rotate, an operator can insert his or her hand into the housing 110 of the fresh air device 100 from the opening 111, remove the first hook 121 and the second hook 122 from the fixing plate 130 and the housing 110, respectively, and then take the foldable elastic filter element 120 out of the fresh air device 100 from the opening 111 from the inside of the housing 110, so as to replace the foldable elastic filter element 120.

In some embodiments, the number of the screw rods 140 may be plural, and the screw parameters of the plural screw rods 140 should be the same so as to ensure that the fixing plate 130 can translate when the screw rods 140 are rotated. For example, the number of the screw rods 140 may be two, and the two screw rods 140 may be respectively disposed at two sides of the foldable elastic filter element 120 in the direction of the opening 111, and when the foldable elastic filter element 120 needs to be folded, the screw rods 140 at two sides of the foldable elastic filter element 120 need to be synchronously rotated at the same time, so that the fixing plate 130 can translate along the direction of the opening 111.

For example, the number of the screw rods 140 may be three or more, and when the number of the screw rods 140 is set to three or more, the screw rods 140 may be disposed under the foldable elastic filter element 120, and fig. 5 is a schematic view of a fixing plate in the fresh air device according to an embodiment of the present utility model, and fig. 5 illustrates a case where three screw rods 140 are disposed under the foldable elastic filter element 120. A protruding structure is provided under the fixing plate 130, and a screw through hole is provided on the protruding structure to allow the screw 140 to rotate in the screw hole 131.

Similarly, when the number of the screw rods 140 is more than three, the same threaded holes 131 can be arranged at intervals below the fixing plate 130, through holes are correspondingly arranged on the shell 110, the other ends of the screw rods 140 penetrate out of the shell 110 from the through holes, the number of the screw rods 140 is not easy to be excessive, and the excessive screw rods 140 are arranged below the foldable elastic filter element 120 and can block the flow of air flow, so that the operation of the fresh air device 100 is not facilitated. In addition, the screw hole 131 may be provided above the fixing plate 130, and the screw 140 may be disposed above the foldable elastic filter element 120 accordingly.

In the above embodiment, when it is desired to fold and compress the foldable elastic filter element 120, the plurality of screw rods 140 need to be secured to be rotated simultaneously and synchronously. If the simultaneous rotation is not possible, the movement of both ends of the fixing plate 130 is not synchronized when the fixing plate 130 moves to the opening 111 side, and the fixing plate 130 may be deviated, thereby causing the operator to be more laborious when rotating the screw 140, and the locking phenomenon may occur due to the excessive deviation of the fixing plate 130.

In order to avoid the above problem, when the plurality of screw rods 140 are provided, a linkage (not shown in the figure) may be further provided in the fresh air device 100, and the linkage is connected to the plurality of screw rods 140 respectively and drives the plurality of screw rods 140 to rotate synchronously. The fresh air device 100 can be input by only one external power, and then the externally input power is respectively transmitted to each screw rod 140 through the linkage device, so that each screw rod 140 can synchronously rotate at the same time, an operator can conveniently rotate the screw rods 140 more labor-saving, and the phenomena of difficult movement, clamping and the like of the fixed plate 130 are avoided.

The linkage device can use a combination form of gears and a meshing belt, and the gear meshing transmission can ensure constant instantaneous transmission ratio and realize two-shaft transmission with various position requirements. For example, in the case where two screw rods 140 are provided in the fresh air device 100, the same gears may be provided at the first ends of the two screw rods 140, respectively, the transmission ratio between the two screw rods 140 is 1:1, and the two gears are sleeved with a meshing belt to connect the two gears. When one of the screw rods 140 is selected as a power input shaft and the screw rods 140 serving as power input rotates, the gear arranged at the first end of the screw rod 140 and the screw rods 140 synchronously rotate, and the movement is transmitted to the other screw rod 140 through the meshing belt, so that the other screw rod 140 is driven to synchronously rotate, linkage of the two screw rods 140 is realized, the two screw rods 140 can simultaneously rotate and can rotate by the same angle, two ends of the fixing plate 130 can simultaneously move towards the direction of the opening 111, the movement distance is always equal, and the fixing plate 130 is ensured to translate along the direction of the opening 111.

In addition, the linkage may also use a gear drive.

In some embodiments, the number of the screw rods 140 is one, fig. 6 is a schematic view of a filter element in a fresh air device according to another embodiment of the present utility model, and fig. 7 is a schematic view of a fixing plate in a fresh air device according to another embodiment of the present utility model. The first end of the screw 140 is disposed at the middle position of the fixing plate 130, the screw 140 is disposed at the middle position below the foldable elastic filter element 120 along the direction of the opening 111, a downward protruding structure is disposed below the middle position of the fixing plate 130, a threaded through hole is disposed on the protruding structure, the threaded through hole is matched with the screw 140, and the other end of the screw 140 passes through the housing 110 below the opening 111.

In some embodiments, a sliding groove 112 is provided inside the housing 110 in the direction of the opening 111, and the sliding groove 112 is provided in the direction of the opening 111 such that the fixing plate 130 moves on the sliding groove 112. In some embodiments, the sliding groove 112 is not required, for example, when the number of the screw 140 is plural, the fixing plate 130 may directly move on the screw 140 with the screw 140 as a guide, and the sliding groove 112 is not required to be specially provided. When the number of the screw rods 140 is one, the sliding groove 112 needs to be provided in the fresh air device 100, the fixing plate 130 is on one screw rod 140, the horizontal stable state cannot be maintained, at least one other supporting portion is required for the fixing plate 130, and the fixing plate 130 can be in the horizontal state.

The housing 110 is provided with a sliding groove 112 in the opening 111 along the opening 111 direction inside the opening 111, the sliding groove 112 is a groove provided on an inner wall of the housing 110, the inner wall surface is recessed to both sides, the sliding grooves 112 correspondingly arranged are provided on both opposite inner walls, the sliding groove 112 extends in the opening 111 direction inside the housing 110, and both ends of the fixing plate 130 are respectively placed in the sliding grooves 112 on both sides. The size of the sliding groove 112 should be at least larger than the size of both end portions of the fixing plate 130 so that both end portions of the fixing plate 130 can be put into the sliding groove 112. The sliding groove 112 can relatively stably clamp the fixed plate 130 in the sliding groove 112, and the fixed plate 130 moves more stably. Both end portions of the fixing plate 130 are slidably disposed in the sliding groove 112 such that the fixing plate 130 can relatively move with respect to the housing 110, thereby achieving folding compression of the foldable elastic filter cartridge 120.

In other embodiments, the sliding channel 112 may be replaced with a sliding track or rod.

In some embodiments, a crank 142 is provided on a second end of the screw 140 for an operator to operate the screw 140 for rotation. The second end of the screw 140 may also be provided in the form of a turntable for an operator to operate the screw 140 for rotation.

In some embodiments, a cover plate 113 may be disposed outside the opening 111 of the housing 110, where the cover plate 113 may seal the opening 111, prevent air flow from overflowing during operation of the fresh air device 100, and may also play a role in dust prevention.

When the filter element needs to be replaced, the cover plate 113 can be opened first, the fixing plate 130 is driven to move to one side of the opening 111 by rotating the screw rod 140, so that the foldable elastic filter element 120 fixed between the fixing and the shell 110 is folded and compressed, after the foldable elastic filter element 120 is folded and compressed, the first connecting devices and the second connecting devices on two sides of the foldable elastic filter element 120 along the direction of the opening 111 are respectively opened, the foldable elastic filter element 120 is taken out from the inside of the shell 110 from the opening 111, and then the cover plate 113 is closed, so that dust can be prevented from entering the inside of the fresh air device 100.

When the foldable elastic filter element 120 needs to be assembled into the fresh air device 100, the foldable elastic filter element 120 is folded and compressed and the cover plate 113 sealing the opening 111 is opened, then the foldable elastic filter element 120 in a folded and compressed state is placed into the shell 110 from the opening 111, and two sides of the foldable elastic filter element 120 along the direction of the opening 111 are respectively connected and fixed on the fixing plate 130 and the shell 110 through the first connecting device and the second connecting device. By rotating the screw 140, the foldable elastic filter element 120 is gradually unfolded and then the cover plate 113 is closed as the rotation fixing plate 130 of the screw 140 moves to a side away from the opening 111 direction. When the fresh air device 100 is in an operating state, the cover plate 113 can seal the opening 111 to prevent air flow from overflowing.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been shown and described herein in detail, many other variations or modifications of the utility model consistent with the principles of the utility model may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the utility model. Accordingly, the scope of the present utility model should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A fresh air device, characterized by comprising:

a housing provided with an opening;

The foldable elastic filter element is detachably arranged in the shell through the opening, and one side of the foldable elastic filter element, which is close to the opening, is fixed on the shell;

the fixing plate is arranged on one side of the foldable elastic filter element far away from the opening;

At least one screw rod is arranged along the direction of the opening, the first end of each screw rod is connected with the fixing plate, the second end of each screw rod penetrates through the shell and is configured to drive the fixing plate to move towards the opening direction, so that the foldable elastic filter element is compressed in the opening direction, and the size of the foldable elastic filter element when being taken out is reduced.

2. The fresh air device according to claim 1, wherein,

The foldable elastic filter element further comprises:

The first connecting device is arranged on one side of the foldable elastic filter element away from the opening and is used for connecting the foldable elastic filter element and the fixing plate;

The second connecting device is arranged on one side of the foldable elastic filter element, which is close to the opening, and is used for connecting the foldable elastic filter element with the shell.

3. The fresh air device according to claim 2, wherein,

The first connecting device comprises at least one first hook, one end of the first hook is connected with the foldable elastic filter element, and the first hook is configured to pull the foldable elastic filter element and hook the foldable elastic filter element on the fixing plate;

The second connecting device comprises at least one second hook, one end of the second hook is connected with the foldable elastic filter element, and the second hook is configured to pull the foldable elastic filter element and hook the foldable elastic filter element on the shell.

4. The fresh air device according to claim 1, wherein,

The fixing plate comprises at least one threaded hole, the threaded holes are arranged in one-to-one correspondence with the screw rods, and the first ends of the screw rods are configured to rotate in the threaded holes, so that the fixing plate moves along with the rotation of the screw rods in the opening direction.

5. The fresh air device according to claim 1, wherein,

The number of the screw rods is multiple, and the screw rods are arranged at intervals along the direction perpendicular to the opening direction.

6. The fresh air device of claim 1, further comprising:

And the linkage device is respectively connected with the plurality of screw rods and is configured to drive the plurality of screw rods to synchronously rotate.

7. The fresh air device according to claim 1, wherein,

The number of the screw rods is one, and the first ends of the screw rods are arranged at the middle positions of the fixing plates.

8. The fresh air device according to claim 1, wherein,

The inside sliding tray that is provided with along the opening direction of casing, the sliding tray is followed the orientation setting of opening, so that the fixed plate is in the sliding tray is removed.

9. The fresh air device according to claim 1, wherein,

And a crank is arranged at the second end of the screw rod so that an operator can operate the screw rod to rotate.

10. The fresh air device according to claim 1, wherein,

And a cover plate is arranged outside the opening of the shell and is configured to seal the opening, so that air flow is prevented from overflowing when the fresh air device works.